FSP系统建模与仿真分析

Modeling and Simulation for FSP System

FSP(fission surface power)是美国经过充分研究论证的一种空间堆。为研究FSP系统的瞬态特性,对FSP系统各部件进行建模,并编写相关程序。该程序对系统稳态工况进行仿真,计算结果和稳态设计值符合良好。该程序对反应性引入以及主泵停止后再启动工况进行了仿真,计算结果趋势合理,证明了模型、建模思想以及建模方法的正确性。结果表明反应性引入时功率以及温度参数的振荡和回路之间温度变化快慢不同有关,且主泵停止后再启动的时间间隔越小越好。该程序可为与FSP相类似的反应堆系统的瞬态分析和安全分析提供参考。

FSP(fission surface power) is a kind of space reactor fully investigated and demonstrated by the United States. To investigate the transient characteristics of the FSP system, the components of the FSP system were modeled and a related program was developed. The program simulated the steady state operating conditions of the system. The results show that the steady state calculation results are in good agreement with design values. A reactivity insertion transient and primary pump restart after stop transient were simulated. The calculation results are reasonable in trends, and it proves that the method and idea of modeling with the models themselves are correct. The results show that the oscillation of system’s power and temperature after a positive reactivity insertion is related with the different speeds of temperature change of loops in the system, also the smaller the interval between primary pump stop and restart, the better. This program provides a reference for the transient analysis and safety analysis of reactor system similar to the FSP system.